add regression test for #346

test/__snapshots__/fixtures.test.ts.snap

@@ -113,6 +113,15 @@ Enter Identifier
 Enter Literal"
 `;
 
+exports[`fixtures > require-esm > require-esm-stderr 1`] = `
+"(node:11558) ExperimentalWarning: CommonJS module <cwd>/index.cjs is loading ES Module <cwd>/_dist/esm.js using require().
+Support for loading ES Module in require() is an experimental feature and might change at any time
+(Use \`node --trace-warnings ...\` to show where the warning was created)
+broken! { mod: { fn: {}, file: {} } }"
+`;
+
+exports[`fixtures > require-esm > stdout 1`] = `""`;
+
 exports[`fixtures > syntax > stdout 1`] = `
 "Optional chaining: undefined
 Nullish coalescing: 0

test/fixtures.test.ts

@@ -47,6 +47,8 @@ describe("fixtures", async () => {
 
       if (name.includes("error")) {
         expect(cleanUpSnap(stderr)).toMatchSnapshot("stderr");
+      } else if (name === "require-esm") {
+        expect(cleanUpSnap(stderr)).toMatchSnapshot("require-esm-stderr");
       } else {
         // expect no error
         expect(stderr).toBe("");

test/fixtures/require-esm/_dist/esm.js

@@ -0,0 +1,3 @@
+import fn from "./fn.js";
+import file from "./file";
+export default { fn, file };

test/fixtures/require-esm/_dist/file.js

@@ -0,0 +1 @@
+module.exports = {};

test/fixtures/require-esm/_dist/fn.js

@@ -0,0 +1 @@
+module.exports = function () {};

test/fixtures/require-esm/index.cjs

@@ -0,0 +1,18 @@
+async function run() {
+  let mod;
+  try {
+    mod = require("./_dist/esm.js");
+  } catch {
+    const { createJiti } = await import("../../../lib/jiti.mjs");
+    const jiti = createJiti(__filename, { interopDefault: true });
+    mod = await jiti.import("./_dist/esm.js");
+  }
+  mod = mod.default;
+  if (typeof mod.fn === "function") {
+    console.log("Works!");
+    return;
+  }
+  console.error("broken!", { mod });
+}
+
+run();

test/fixtures/require-esm/package.json

@@ -0,0 +1,3 @@
+{
+  "type": "-"
+}